Review: Samsung Galaxy Attain 4G for MetroPCS
The Attain 4G runs all of the stock Android 2.3.6 messaging applications, and doesn't offer anything new or unique.
It has the generic email app for POP/IMAP/Exchange email, and the dedicated Gmail application for Google users. Both of these applications are capable and time-tested.
The stock SMS/MMS app is loaded on the Attain 4G, and I didn't notice any different or unusual behavior with it. It offers threaded conversations, as always.
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As for IM, the Attain 4G has Google Talk on board, and a MetroPCS-branded IM catch-all app that covers AIM, Google Talk, Windows Live, Yahoo, etc. The native Google Talk client or something else that you find in the Android Market are your best bets, as the MetroPCS IM app is crashy and very, very slow.
On the social networking front, the Attain defaults to the same MetroPCS IM app, as it also supports Facebook and Twitter messaging. I'd highly recommend you skip this app entirely and download the native Facebook and Twitter apps. They offer a much richer experience than the generic app.